the fbi uncovered the e-mails between kelly and john allen, the top commander in afghanistan. tony? >>> thank you. whether they've been forced out or leaving voluntarily, leaders in business, government, sports, and even entertainment can face an awkward transition when they step down. while it's unclear how david petraeus' departure will affect the cia, others in the spotlight have managed to leave on top. joining us now is david heenan, a visiting professor at georgetown university, and author of the brand-new book, "leaving on top graceful exits for leaders" which is being published today. welcome to the show. boy, probably could not have picked a better week for this book to come out. >> a lot going on. lance armstrong not that long ago, lockheed president just resigned under almost the same circumstances. >> yeah. frequently we look at these situations and we think, my goodness, i don't know what i would do in that situation. it can be very difficult making it transition, whether you're under scandal or not. talk a little bit about these situations that you've just mentioned an